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D( x )
49*x^2-4 = 0
(7*x)/2 = 0
49*x^2-4 = 0
49*x^2-4 = 0
49*x^2 = 4 // : 49
x^2 = 4/49
x^2 = 4/49 // ^ 1/2
abs(x) = 2/7
x = 2/7 or x = -2/7
(7*x)/2 = 0
(7*x)/2 = 0
7/2*x = 0 // : 7/2
x = 0
x in (-oo:-2/7) U (-2/7:0) U (0:2/7) U (2/7:+oo)
(7*x)/(49*x^2-4)+7/((7*x)/2) = 0
(7*x)/(49*x^2-4)+2/x = 0
(7*x*x)/(x*(49*x^2-4))+(2*(49*x^2-4))/(x*(49*x^2-4)) = 0
2*(49*x^2-4)+7*x*x = 0
105*x^2-8 = 0
(105*x^2-8)/(x*(49*x^2-4)) = 0
(105*x^2-8)/(x*(49*x^2-4)) = 0 // * x*(49*x^2-4)
105*x^2-8 = 0
105*x^2 = 8 // : 105
x^2 = 8/105
x^2 = 8/105 // ^ 1/2
abs(x) = (8/105)^(1/2)
x = (8/105)^(1/2) or x = -(8/105)^(1/2)
x in { (8/105)^(1/2), -(8/105)^(1/2) }
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